Because of that, it is common for a lookup routine to increase the reference count on the matching element, and let the caller release it when necessary.
Because of that, it is common for a lookup routine to increase the reference count on the matching element, and let the caller release it when necessary.
所以，一个查询常式在相配要素上增加叁考计数,而且让访客释放它通常是必需的。